2010BS EN 14425-3:2010 Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Chevron notched beam (CNB) method
2004BS DD CEN/TS 14425-3:2003 Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3:Chevron notched beam (CNB) method